Best way to get Got Your Back?

[Nuke]

Seeing as how Alex's only way to knock enemies down is to hit them with doors I'm having trouble finding a spot to pull this off. Any tips?

[KronQ]

Just bait a single enemy into a room, punch him with a door, position Ash outside the room, bait more enemies with shooting and then finish the downed one with Alex you while Ash sprays incoming hostiles. It's easier than it sounds, did it the first try on Execution.

[DSpecht]

The second floor in Execution is a good place to get it. In the central room there is a guy patroling along a door and two other enemies in the room.

[Gamecrazy009]

Deathwish's first part is probably the best, there's a door across from you: shoot off a round and cut down the first Mobster and knock down the oncoming barrage with the door than execute and spray fire until everything dies.